Datasheet

TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
14 Debouncing Time
Table 14-1 lists the debouncing functions.
Table 14-1. Debouncing Time
Debouncing Functions Block Programmable Debouncing Time Default
Main battery charged threshold (<3.2 V) Battery monitoring No 580 μs 580 μs
Main battery low threshold detection (<2.7 V) No 60 μs 60 μs
Main battery plug detection (with charger
No 60 μs 60 μs
connected)
BCI
Charger unplug detection
(1)
No 1 x 50 ms 1 x 50 ms
(automatic charge)
Charger plug detection
(1)
BCI No 9 x 50 ms 9 x 50 ms
Debouncing functions interrupt generation
Power No 125.6 μs 125.6 μs
debounce for charger plug
USB plug detection/VBUS precharge (same
BCI No 9 x 50 ms 9 x 50 ms
debouncing as charger plug)
(1)
Battery presence plug/unplug
(1)
BCI No 9 x 50 ms 9 x 50 ms
Battery thermistor in/out of range
(1)
BCI No 4 x 50 ms 4 x 50 ms
0 to 250 ms
Plug/unplug detection VBUS
(2)
USB Yes (32/32,468-second 28 ms
steps)
0 to 250 ms
Plug/unplug detection ID
(3)
USB Yes (32/32,468-second 50 ms
steps)
Debouncing functions interrupt generation
Power Yes 0 to 250 ms 30 ms
debounce for VBUS and ID
(4)
Hot-die detection Thermistor No 60 μs 60 μs
Thermal shutdown detection No 60 μs 60 μs
PWRON
(5)
Start/stop button No 31.25 ms 31.25 ms
NRESWARM Button reset No 60 μs 60 μs
SIM card plug/unplug GPIO Yes 0 or 30 ms ± 1 ms 0 ms
Headset detection (plug/unplug) GPIO Yes 0 or 30 ms ± 1 ms 0 ms
MMC1/2 (plug/unplug) GPIO Yes 0 or 30 ms ± 1 ms 0 ms
(1) According to the capture of the event, debouncing time can vary between 50 ms and 50 ms + dT (dT included in 0 < dT > 50 ms).
Figure 14-1 shows and explains this possible variation of the debouncing time.
(2) Programmable in the VBUS_DEBOUNCE register
(3) Programmable in the ID_DEBOUNCE register
(4) Programmable in the RESERVED_E[2:0] CFG_VBUSDEB register
(5) The PWRON signal is debounced 1024 × CLK32K (maximum 1026 × CLK32K) falling edge in master mode.
Copyright © 2008–2011, Texas Instruments Incorporated Debouncing Time 153
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